Table 1: ISO2846-5 SubSTraTe SpecS
Current Spec
Proposed Spec
Target
Tolerance
Target
Tolerance
Colormetric Value
L*
95.5
±
2.0
94
±
1.0
a*
- 0.4
±
1.0
0
±
0.5
b*
4.7
±
1.5
0
±
0.5
Gloss
ISO8254-1
70.0 min
80.0 max
70.0 min
80.0 max
Mass per area
g/m2
150
±
150
±
3
Optical Brightener
wt%
no spec
0%
Roughness
at 1N/mm2
0.9/1000 mm min
1.1/1000 mm max
0.9/1000 mm min
1.1/1000 mm max
% Chemical pulp
wt%
no spec
100%
Current spec: “Note, in practice there has been only one supplier of this material and it has become the defacto standard. This material is the gloss-
coated wood free paper, Phoenix Imperial (2).
2) Phoenix Imperial APCOII/II, may be purchased from Scheufelen. Phoenix Imperial is the trade name of a product supplied by Scheufelen, D -73250
Lenningen, Germany. This information is given for the convenience of users of this part of ISO 2846 and does not constitute an endorsement by ISO of the
product named. ”
ultimate specification values are those for the actual printed
result in every case. ISO 2846 is a specification on the inks.
SubSTraTe aT ISSue
A few years ago, consumer products companies and graph-
ics suppliers were suggesting that the ISO 2846 color targets
be consolidated to the litho targets to make designs even more
portable for cross platform printing and to yield a more uniform
ultimate color result. This obviously relaxes more barriers for
flexo’s further penetration of the litho market.
But FQC was concerned with this approach because no
work had been done on the original ISO 2846-5 specs to
demonstrate that whatever was specified for the standard
inks meet the printed color target specifications (ISO 12647).
22
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2013 www.flexography.org
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